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id="post-info"><h1 class="post-title">拖拽</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-03-27T16:00:00.000Z" title="发表于 2020-03-28 00:00:00">2020-03-28</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2020-06-03T16:00:00.000Z" title="更新于 2020-06-04 00:00:00">2020-06-04</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E9%A1%B9%E7%9B%AE%E5%AE%9E%E6%88%98/">项目实战</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.8k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>7分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="拖拽"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="拖拽"><a href="#拖拽" class="headerlink" title="拖拽"></a>拖拽</h1><h2 id="思路"><a href="#思路" class="headerlink" title="思路"></a>思路</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 我们现在已知的有 鼠标按下的位置 A 鼠标在移动的时候的位置 B 盒子开始的位置 C1</span><br><span class="line"><span class="number">2.</span> 所以盒子当前的位置 D = B - A + C</span><br><span class="line"><span class="number">3.</span> 拖拽触发的条件 鼠标按住盒子才开始拖拽 鼠标抬起拖拽就算结束</span><br><span class="line"><span class="number">4.</span> 拖拽开始后 鼠标移动盒子才会跟着移动</span><br><span class="line"><span class="number">5.</span> 所以当我们鼠标按下的时候 mousedown 记录 A(鼠标按下的位置) C(盒子开始的位置)</span><br><span class="line"><span class="number">6.</span> 鼠标移动的时候 mousemove 获取 B(鼠标随时移动的位置) 动态计算出D 修改盒子样式 让盒子跟着移动</span><br><span class="line"><span class="number">7.</span> 鼠标抬起 mouseup 取消拖拽</span><br></pre></td></tr></table></figure>
<p><img src="1.png" alt=""></p>
<h2 id="鼠标按下"><a href="#鼠标按下" class="headerlink" title="鼠标按下"></a>鼠标按下</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 当鼠标按下的时候 我们要记录我们按下的位置 还有 盒子的初始位置 </span><br><span class="line"><span class="number">2.</span> 记录这个位置的时候 我们 要在移动中 也要使用 也就是说 我们在mousemove的时候 也要使用到这个数据 </span><br><span class="line"><span class="number">3.</span> 所以这个时候 我们可以 把这些数据记录在全局上 方便使用 也可以直接挂在到我们的box上 因为 移动事件 也是在我们box上发生的 我们可以通过<span class="built_in">this</span> 取到</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//鼠标按下的时候 执行down函数</span></span><br><span class="line">box.addEventListener(<span class="string">&#x27;mousedown&#x27;</span>,down)</span><br><span class="line"><span class="keyword">const</span> down = <span class="function"><span class="keyword">function</span> (<span class="params">ev</span>) </span>&#123;</span><br><span class="line">    <span class="comment">//1.拿到盒子初始位置 这些信息可能未来会在别的函数中应用</span></span><br><span class="line">    <span class="comment">//所以我们要把它挂在我们盒子的自定义属性上</span></span><br><span class="line">    <span class="keyword">let</span> &#123;</span><br><span class="line">        top,</span><br><span class="line">        left</span><br><span class="line">    &#125; = <span class="built_in">this</span>.getBoundingClientRect()</span><br><span class="line">    <span class="comment">//2.把我们拿到的信息 挂在到我们的盒子上</span></span><br><span class="line">    <span class="built_in">this</span>.startT = top</span><br><span class="line">    <span class="built_in">this</span>.startL = left</span><br><span class="line">    <span class="comment">//3.鼠标开始位置 也挂在我们的盒子上</span></span><br><span class="line">    <span class="built_in">this</span>.startX = ev.clientX</span><br><span class="line">    <span class="built_in">this</span>.startY = ev.clientY   </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="鼠标移动"><a href="#鼠标移动" class="headerlink" title="鼠标移动"></a>鼠标移动</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 鼠标移动的时候 我们要动态计算 我们盒子移动的距离</span><br><span class="line"><span class="number">2.</span> 这个时候 我们有个顺序 一定是 鼠标按下的时候 才会监听我们的移动事件</span><br><span class="line"><span class="number">3.</span> 所以 鼠标移动的事件 要写在 我们的按下里面</span><br><span class="line"><span class="number">4.</span> 并且 要时刻计算 我们盒子移动的距离 这里 我们已经把我们需要的数据挂在到我们盒子上了</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> down = <span class="function"><span class="keyword">function</span> (<span class="params">ev</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> &#123;</span><br><span class="line">        top,</span><br><span class="line">        left</span><br><span class="line">    &#125; = <span class="built_in">this</span>.getBoundingClientRect()</span><br><span class="line">    <span class="built_in">this</span>.startT = top</span><br><span class="line">    <span class="built_in">this</span>.startL = left</span><br><span class="line">    <span class="built_in">this</span>.startX = ev.clientX</span><br><span class="line">    <span class="built_in">this</span>.startY = ev.clientY   </span><br><span class="line">    <span class="comment">//2. 这里注意只有鼠标按下的时候  而这里面this 就是当前的盒子 才能开始移动</span></span><br><span class="line">    <span class="built_in">this</span>.addEventListener(<span class="string">&#x27;mousemove&#x27;</span>,move)</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//2.鼠标移动拖拽中</span></span><br><span class="line"><span class="keyword">const</span> move = <span class="function"><span class="keyword">function</span>(<span class="params">ev</span>)</span>&#123;</span><br><span class="line">    <span class="comment">// 动态算出来盒子应该移动的位置 </span></span><br><span class="line">    <span class="keyword">let</span> curL = ev.clientX - <span class="built_in">this</span>.startX + <span class="built_in">this</span>.startL</span><br><span class="line">        curT = ev.clientY - <span class="built_in">this</span>.startY + <span class="built_in">this</span>.startT</span><br><span class="line">    <span class="comment">// 然后设置我们的盒子移动的距离</span></span><br><span class="line">    <span class="built_in">this</span>.style.left = curL + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">    <span class="built_in">this</span>.style.top = curT + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="鼠标抬起"><a href="#鼠标抬起" class="headerlink" title="鼠标抬起"></a>鼠标抬起</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 鼠标抬起 我们要做的事情 就是要解绑 我们移动事件 和按下事件</span><br><span class="line"><span class="number">2.</span> 这里也是用<span class="built_in">this</span> 即可 因为 事件源都是我们的盒子</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> down = <span class="function"><span class="keyword">function</span> (<span class="params">ev</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> &#123;</span><br><span class="line">        top,</span><br><span class="line">        left</span><br><span class="line">    &#125; = <span class="built_in">this</span>.getBoundingClientRect()</span><br><span class="line">    <span class="built_in">this</span>.startT = top</span><br><span class="line">    <span class="built_in">this</span>.startL = left</span><br><span class="line">    <span class="built_in">this</span>.startX = ev.clientX</span><br><span class="line">    <span class="built_in">this</span>.startY = ev.clientY   </span><br><span class="line">    <span class="built_in">this</span>.addEventListener(<span class="string">&#x27;mousemove&#x27;</span>,move)</span><br><span class="line">    <span class="comment">//1. 鼠标抬起的时候我们要移除上面的事件</span></span><br><span class="line">    <span class="built_in">this</span>.addEventListener(<span class="string">&#x27;mouseup&#x27;</span>,up)</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> move = <span class="function"><span class="keyword">function</span>(<span class="params">ev</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> curL = ev.clientX - <span class="built_in">this</span>.startX + <span class="built_in">this</span>.startL</span><br><span class="line">        curT = ev.clientY - <span class="built_in">this</span>.startY + <span class="built_in">this</span>.startT</span><br><span class="line">    <span class="built_in">this</span>.style.left = curL + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">    <span class="built_in">this</span>.style.top = curT + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> up = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="comment">//这里面要做的事情 就是 解绑我们的事件</span></span><br><span class="line">    <span class="built_in">this</span>.removeEventListener(<span class="string">&#x27;mousemove&#x27;</span>,move)</span><br><span class="line">    <span class="built_in">this</span>.removeEventListener(<span class="string">&#x27;mouseup&#x27;</span>,up)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="处理边界"><a href="#处理边界" class="headerlink" title="处理边界"></a>处理边界</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 我们需要找到最大边界值</span><br><span class="line"><span class="number">2.</span> 这里我们按照一屏去计算 一屏的安全值 我们通过 <span class="built_in">document</span>.documentElement 去获取</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> box = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;box&#x27;</span>)</span><br><span class="line">    <span class="comment">//4. 拿到了一屏幕的高度和宽度</span></span><br><span class="line">    HTML = <span class="built_in">document</span>.documentElement</span><br><span class="line">    <span class="comment">//4. 设置了边界</span></span><br><span class="line">    minL = <span class="number">0</span></span><br><span class="line">    minT = <span class="number">0</span></span><br><span class="line">    maxL = HTML.clientWidth - box.offsetWidth</span><br><span class="line">    maxT = HTML.clientHeight - box.offsetHeight</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> move = <span class="function"><span class="keyword">function</span>(<span class="params">ev</span>)</span>&#123;</span><br><span class="line">    <span class="comment">// 动态算出来盒子应该移动的位置 </span></span><br><span class="line">    <span class="keyword">let</span> curL = ev.clientX - <span class="built_in">this</span>.startX + <span class="built_in">this</span>.startL</span><br><span class="line">        curT = ev.clientY - <span class="built_in">this</span>.startY + <span class="built_in">this</span>.startT</span><br><span class="line">    <span class="comment">//边界判断</span></span><br><span class="line">    curL = curL &lt; minL ? minL : (curL &gt; maxL?maxL:curL)</span><br><span class="line">    curT = curT &lt; minT ? minT : (curT &gt; maxT?maxT:curT)</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 然后设置我们的盒子移动的距离</span></span><br><span class="line">    <span class="built_in">this</span>.style.left = curL + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">    <span class="built_in">this</span>.style.top = curT + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="鼠标焦点丢失"><a href="#鼠标焦点丢失" class="headerlink" title="鼠标焦点丢失"></a>鼠标焦点丢失</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 首先 我们的拖拽事件 是在指针在盒子上按下的时候 才会执行</span><br><span class="line"><span class="number">2.</span> 鼠标在盒子上按下了 我们能监听到移动事件</span><br><span class="line"><span class="number">3.</span> 如果我在移动的过程 移动过快 而此时 鼠标的指针 已经不在盒子的范围内了 当我们鼠标在移动的的时候 就不管用了</span><br><span class="line"><span class="number">4.</span> 而此时 我们在抬起鼠标的时候  由于我们的鼠标抬起 也是在鼠标按下的时候 才会执行里面的事件 而此时 我们的鼠标已经不在盒子里了 就不会执行我们的抬起事件</span><br><span class="line"><span class="number">5.</span> 这个问题就叫做光标丢失 鼠标焦点丢失</span><br></pre></td></tr></table></figure>
<p><img src="1.gif" alt=""></p>
<h3 id="解决方案"><a href="#解决方案" class="headerlink" title="解决方案"></a>解决方案</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> ie / 火狐下 我们可以使用一个方法 把盒子和 指针绑定在一起</span><br><span class="line"><span class="number">2.</span> 在鼠标抬起的时候 我们在解绑</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> down = <span class="function"><span class="keyword">function</span> (<span class="params">ev</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> &#123;</span><br><span class="line">        top,</span><br><span class="line">        left</span><br><span class="line">    &#125; = <span class="built_in">this</span>.getBoundingClientRect()</span><br><span class="line">    <span class="built_in">this</span>.startT = top</span><br><span class="line">    <span class="built_in">this</span>.startL = left</span><br><span class="line">    <span class="built_in">this</span>.startX = ev.clientX</span><br><span class="line">    <span class="built_in">this</span>.startY = ev.clientY   </span><br><span class="line">    <span class="comment">//ie 下 解决焦点丢失问题</span></span><br><span class="line">    <span class="built_in">this</span>.setCapture()</span><br><span class="line">    <span class="built_in">this</span>.addEventListener(<span class="string">&#x27;mousemove&#x27;</span>,move)</span><br><span class="line">    <span class="built_in">this</span>.addEventListener(<span class="string">&#x27;mouseup&#x27;</span>,up)</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//抬起的时候 我们在解绑</span></span><br><span class="line"><span class="keyword">const</span> up = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="comment">//ie下然后移除</span></span><br><span class="line">    <span class="built_in">this</span>.releaseCapture()</span><br><span class="line">    <span class="built_in">this</span>.removeEventListener(<span class="string">&#x27;mousemove&#x27;</span>,move)</span><br><span class="line">    <span class="built_in">this</span>.removeEventListener(<span class="string">&#x27;mouseup&#x27;</span>,up)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 谷歌下 我们直接移动和 抬起 直接绑定给window  解绑的时候 也是一样 但是要注意this的指向问题 </span></span><br><span class="line"></span><br><span class="line"><span class="keyword">let</span> box = <span class="built_in">document</span>.getElementById(<span class="string">&#x27;box&#x27;</span>)</span><br><span class="line">    <span class="comment">//4. 拿到了一屏幕的高度和宽度</span></span><br><span class="line">    HTML = <span class="built_in">document</span>.documentElement</span><br><span class="line">    <span class="comment">//4. 设置了边界</span></span><br><span class="line">    minL = <span class="number">0</span></span><br><span class="line">    minT = <span class="number">0</span></span><br><span class="line">    maxL = HTML.clientWidth - box.offsetWidth</span><br><span class="line">    maxT = HTML.clientHeight - box.offsetHeight</span><br><span class="line"></span><br><span class="line"><span class="keyword">const</span> down = <span class="function"><span class="keyword">function</span> (<span class="params">ev</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> &#123;</span><br><span class="line">        top,</span><br><span class="line">        left</span><br><span class="line">    &#125; = <span class="built_in">this</span>.getBoundingClientRect()</span><br><span class="line">    <span class="built_in">this</span>.startT = top</span><br><span class="line">    <span class="built_in">this</span>.startL = left</span><br><span class="line">    <span class="built_in">this</span>.startX = ev.clientX</span><br><span class="line">    <span class="built_in">this</span>.startY = ev.clientY   </span><br><span class="line">  	<span class="comment">//3.所以 我们要把这个函数保存一下解绑的时候也放便</span></span><br><span class="line">  	<span class="built_in">this</span>._move = move.bind(<span class="built_in">this</span>)</span><br><span class="line">  	<span class="built_in">this</span>._up = up.bind(<span class="built_in">this</span>)</span><br><span class="line">  	<span class="comment">//1. 为了 解决光标焦点丢失的问题 我们直接绑定给window 并且确保this指向正确</span></span><br><span class="line">    <span class="comment">// window.addEventListener(&#x27;mousemove&#x27;,move.bind(this))</span></span><br><span class="line">    <span class="comment">// window.addEventListener(&#x27;mouseup&#x27;,up.bind(this))</span></span><br><span class="line">    <span class="built_in">window</span>.addEventListener(<span class="string">&#x27;mousemove&#x27;</span>,<span class="built_in">this</span>._move)</span><br><span class="line">    <span class="built_in">window</span>.addEventListener(<span class="string">&#x27;mouseup&#x27;</span>,<span class="built_in">this</span>._up)</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> move = <span class="function"><span class="keyword">function</span>(<span class="params">ev</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">let</span> curL = ev.clientX - <span class="built_in">this</span>.startX + <span class="built_in">this</span>.startL</span><br><span class="line">        curT = ev.clientY - <span class="built_in">this</span>.startY + <span class="built_in">this</span>.startT</span><br><span class="line">    curL = curL &lt; minL ? minL : (curL &gt; maxL?maxL:curL)</span><br><span class="line">    curT = curT &lt; minT ? minT : (curT &gt; maxT?maxT:curT)</span><br><span class="line"></span><br><span class="line">    <span class="built_in">this</span>.style.left = curL + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">    <span class="built_in">this</span>.style.top = curT + <span class="string">&#x27;px&#x27;</span></span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">const</span> up = <span class="function"><span class="keyword">function</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="comment">//2. 但是我们移除的时候会有问题 因为 我们使用了bind 它返回一个匿名函数 所以我们移除的时候 在移除move 就不对了 我们需要移除那个匿名函数</span></span><br><span class="line">    <span class="comment">//window.removeEventListener(&#x27;mousemove&#x27;,move)</span></span><br><span class="line">    <span class="comment">//window.removeEventListener(&#x27;mouseup&#x27;,up)</span></span><br><span class="line">    <span class="comment">//4. 解绑的时候 我们直接找到我们this上的方法就好了</span></span><br><span class="line">  	<span class="built_in">window</span>.removeEventListener(<span class="string">&#x27;mousemove&#x27;</span>,<span class="built_in">this</span>._move)</span><br><span class="line">    <span class="built_in">window</span>.removeEventListener(<span class="string">&#x27;mouseup&#x27;</span>,<span class="built_in">this</span>._up)</span><br><span class="line">&#125;</span><br><span class="line">box.addEventListener(<span class="string">&#x27;mousedown&#x27;</span>,down)</span><br></pre></td></tr></table></figure>
<h2 id="地址"><a href="#地址" class="headerlink" title="地址"></a>地址</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">https:<span class="comment">//github.com/wazer1987/Drag</span></span><br></pre></td></tr></table></figure>
</article><div class="post-copyright"><div class="post-copyright__title"><span class="post-copyright-info"><h>拖拽</h></span></div><div class="post-copyright__type"><span class="post-copyright-info"><a href="http://example.com/2020/03/28/%E6%8B%96%E6%8B%BD/">http://example.com/2020/03/28/%E6%8B%96%E6%8B%BD/</a></span></div><div class="post-copyright-m"><div class="post-copyright-m-info"><div class="post-copyright-a"><h>作者</h><div class="post-copyright-cc-info"><h>北城韩雨</h></div></div><div class="post-copyright-c"><h>发布于</h><div class="post-copyright-cc-info"><h>2020-03-28</h></div></div><div class="post-copyright-u"><h>更新于</h><div class="post-copyright-cc-info"><h>2020-06-04</h></div></div><div class="post-copyright-c"><h>许可协议</h><div class="post-copyright-cc-info"><a class="icon" rel="noopener" target="_blank" title="Creative Commons" href="https://creativecommons.org/"><i class="fab fa-creative-commons"></i></a><a rel="noopener" target="_blank" title="CC BY-NC-SA 4.0" 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class="toc-text">鼠标抬起</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%A4%84%E7%90%86%E8%BE%B9%E7%95%8C"><span class="toc-text">处理边界</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E9%BC%A0%E6%A0%87%E7%84%A6%E7%82%B9%E4%B8%A2%E5%A4%B1"><span class="toc-text">鼠标焦点丢失</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88"><span class="toc-text">解决方案</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%9C%B0%E5%9D%80"><span class="toc-text">地址</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2021/04/16/gin-vue-admin/" title="Gin-Vue-Admin"><img src="/img/gin-vue-admin.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" 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